Greens MLC, Jeremy Buckingham, says he wants to know what contact the Police Minister, Mike Gallacher, has had with coal seam gas explorer, Santos, and with coal miner, Whitehaven Coal.

He's written to the Minister asking him to outline if closures of the Leard, Bibblewindi and Pilliga East State Forests have come at the request of mining and gas companies.

The Forestry Corporation says it was directed by the police to erect the signs, which block unauthorised personnel until April 30 under Clause 6 of the Forestry Regulations 2012 and until May 9 under Clause 7 of the Forestry Regulations 2012.

Jeremy Buckingham says he thinks there are gaps in the information about who met whom, and when.

"Are we seeing state forests handed over for the exclusive use and destruction by these coal and gas companies and then, in effect, the police force of NSW sub-contracted to these operations in the face of community protests," he said?

"We want to know if the Minister is doing this at a direct request of these companies."

The part closure of the Pilliga East State Forest under Clause 7 states, '...the Forestry Corporation of NSW has reserved the area ... for the exclusive use of Santos Limited during the period.'

It warns $2,200 fines are liable to anyone who enters the area without authorisation during the closure period.

The closures of the Leard State Forest and the Bibblewindi State Forests under Clause 6 also warn of fines if unauthorised personnel enter the prohibited area.

Jeremy Buckingham says he wants urgent clarification from the Police Minister about the closures.

He says alleged public safety concerns have been cited as the reasons for the closure and that doesn't make sense to him.

"I think the protestors who have been protesting and occupying the forest over many months have done so with a complete regard for safety, there have been no unsafe incidents in those state forests," he said.

"Is this is a heavy-handed tactic by the government to try and shut down legitimate dissent?"

Meantime, locals confirmed road closures around the perimeter of the state forests.

Maules Creek resident, Roselyn Druce, estimated a closure zone of between 12 to 15 kilometres from the site where 70 protestors were arrested on Monday, March 31.

"The basic roads they've got blocked today are the Therribri Road and Harparary Road from Maules Creek to Boggabri," she said.

"They [the police] let some people through and I was told if I came up to [the protestors'] camp I could come back, but I was told there was no way I would be able to bring anyone back with me to my place."

Ms Druce was among the 70 people arrested near Maules Creek this week.